I've buried my 2 normal shovels every day and dug them up 2 days later every day for 2 weeks, but they're never golden. What am I doing wrong? Do I need to dig them up with a normal shovel instead of a silver one?

The ability to make bell trees is kinda "meh" as the chances of actually making money on those are actually against you.

The silver shovel has a chance of turning your daily bell rock into a gem rock that spits out a whole bunch of gems, including gold ones. If you're going after gold furniture, it's nice to have that chance.

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I once saw something on a palm tree, and I thought "rare beetle!" so I
pulled out my net and caught it, but it was just a tree bass. -DrTapeworm